Designated a National Monument in 1906 by President Teddy Roosevelt, Wyoming’s Devils Tower was the victim of a typographical error at birth. As the National Park Service’s website puts it:
When the proclamation establishing Devils Tower was published, the apostrophe was unintentionally dropped from “Devil’s”—and this clerical error was never officially corrected.
The 867′ tall Devils Tower in Autumn. Tweeted by the Department of the Interior, 10/24/13.